Add endian.h header for byte order detection. Ensure that headers can be

included individually.
2013-03-18 23:06:06 -05:00
1 parent 9fcecba7cc
commit 99ed654ccd
@@ -0,0 +1,130 @@
+/*
+Copyright Redshift Software, Inc. 2013
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifndef BOOST_PREDEF_ENDIAN_H
+#define BOOST_PREDEF_ENDIAN_H
+
+#include <boost/predef/version_number.h>
+#include <boost/predef/make.h>
+#include <boost/predef/library/c.h>
+
+/*`
+[heading `BOOST_ENDIAN_BIG_BYTE`, `BOOST_ENDIAN_LITTLE_BYTE`, `BOOST_ENDIAN_BIG_WORD`, `BOOST_ENDIAN_LITTLE_WORD`]
+
+Detection of endian memory ordering.
+ */
+
+#define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
+#define BOOST_ENDIAN_BIG_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE
+#define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
+#define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE
+
+/* GNU libc provides a header defining __BYT_ORDER. */
+#if BOOST_LIB_C_GNU
+#   include <endian.h>
+#endif
+
+/* GNU libc style __BYTE_ORDER macros. */
+#if defined(__BYTE_ORDER)
+#   if (__BYTE_ORDER == __BIG_ENDIAN)
+#       undef BOOST_ENDIAN_BIG_BYTE
+#       define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#   if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#       undef BOOST_ENDIAN_LITTLE_BYTE
+#       define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#   if (__BYTE_ORDER == __PDP_ENDIAN)
+#       undef BOOST_ENDIAN_LITTLE_WORD
+#       define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#endif
+
+/* Built-in byte-swpped big-endian macros. */
+#if !BOOST_ENDIAN_BIG_BYTE
+#   if defined(__BIG_ENDIAN__) || \
+        defined(__ARMEB__) || \
+        defined(__THUMBEB__) || \
+        defined(__AARCH64EB__) || \
+        defined(_MIPSEB) || \
+        defined(__MIPSEB) || \
+        defined(__MIPSEB__)
+#       undef BOOST_ENDIAN_BIG_BYTE
+#       define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#endif
+
+/* Built-in byte-swapped little-endian macros. */
+#if !BOOST_ENDIAN_LITTLE_BYTE
+#   if defined(__LITTLE_ENDIAN__) || \
+        defined(__ARMEL__) || \
+        defined(__THUMBEL__) || \
+        defined(__AARCH64EL__) || \
+        defined(_MIPSEL) || \
+        defined(__MIPSEL) || \
+        defined(__MIPSEL__)
+#       undef BOOST_ENDIAN_LITTLE_BYTE
+#       define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#endif
+
+/* Some architectures are strictly one endianess (as opposed
+ * the current common bi-endianess).
+ */
+#if !BOOST_ENDIAN_BIG_BYTE && \
+    !BOOST_ENDIAN_BIG_WORD && \
+    !BOOST_ENDIAN_LITTLE_BYTE && \
+    !BOOST_ENDIAN_LITTLE_WORD
+#   include <boost/predef/architecture.h>
+#   if BOOST_ARCH_M68K || \
+        BOOST_ARCH_PARISK || \
+        BOOST_ARCH_SYS370 || \
+        BOOST_ARCH_SYS390 || \
+        BOOST_ARCH_Z
+#       undef BOOST_ENDIAN_BIG_BYTE
+#       define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#   if BOOST_ARCH_AMD64 || \
+        BOOST_ARCH_IA64 || \
+        BOOST_ARCH_X86
+#       undef BOOST_ENDIAN_LITTLE_BYTE
+#       define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#endif
+
+#if BOOST_ENDIAN_BIG_BYTE
+#   define BOOST_ENDIAN_BIG_BYTE_AVAILABLE
+#endif
+#if BOOST_ENDIAN_BIG_WORD_BYTE
+#   define BOOST_ENDIAN_BIG_WORD_BYTE_AVAILABLE
+#endif
+#if BOOST_ENDIAN_LITTLE_BYTE
+#   define BOOST_ENDIAN_LITTLE_BYTE_AVAILABLE
+#endif
+#if BOOST_ENDIAN_LITTLE_WORD_BYTE
+#   define BOOST_ENDIAN_LITTLE_WORD_BYTE_AVAILABLE
+#endif
+
+#define BOOST_ENDIAN_BIG_BYTE_NAME "Byte-Swapped Big-Endian"
+#define BOOST_ENDIAN_BIG_WORD_NAME "Word-Swapped Big-Endian"
+#define BOOST_ENDIAN_LITTLE_BYTE_NAME "Byte-Swapped Little-Endian"
+#define BOOST_ENDIAN_LITTLE_WORD_NAME "Word-Swapped Little-Endian"
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_BIG_BYTE,BOOST_ENDIAN_BIG_BYTE_NAME)
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_BIG_WORD,BOOST_ENDIAN_BIG_WORD_NAME)
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_LITTLE_BYTE,BOOST_ENDIAN_LITTLE_BYTE_NAME)
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_LITTLE_WORD,BOOST_ENDIAN_LITTLE_WORD_NAME)
+
+
+#endif